128288999 has 8 divisors (see below), whose sum is σ = 130345488. Its totient is φ = 126247680.

The previous prime is 128288981. The next prime is 128289017. The reversal of 128288999 is 999882821.

It is an interprime number because it is at equal distance from previous prime (128288981) and next prime (128289017).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128288999 - 2²⁴ = 111511783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128288929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13904 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (16293186).

Almost surely, 2^128288999 is an apocalyptic number.

128288999 is a deficient number, since it is larger than the sum of its proper divisors (2056489).

128288999 is an equidigital number, since it uses as much as digits as its factorization.

128288999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585.

The product of its digits is 1492992, while the sum is 56.

The square root of 128288999 is about 11326.4733699418. The cubic root of 128288999 is about 504.3474222835.

The spelling of 128288999 in words is "one hundred twenty-eight million, two hundred eighty-eight thousand, nine hundred ninety-nine".